+/* Type alias for struct c_expr. This allows to use the structure
+ inside the VEC types. */
+typedef struct c_expr c_expr_t;
+
+/* A varray of c_expr_t. */
+DEF_VEC_O (c_expr_t);
+DEF_VEC_ALLOC_O (c_expr_t, gc);
+DEF_VEC_ALLOC_O (c_expr_t, heap);
+
+/* Append a new c_expr_t element to V. */
+#define C_EXPR_APPEND(V, ELEM) \
+ do { \
+ c_expr_t *__elem_p = VEC_safe_push (c_expr_t, gc, V, NULL); \
+ *__elem_p = (ELEM); \
+ } while (0)
+